导出excel表格(不按模板导出)

1. 新建项目

2. pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.excel</groupId>
    <artifactId>Excel</artifactId>
    <version>1.0-SNAPSHOT</version>
    <!-- Spring boot 父引用-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.1.RELEASE</version>
    </parent>
    <dependencies>

        <!-- Spring boot 核心web-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.14</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.14</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-scratchpad -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-scratchpad</artifactId>
            <version>3.14</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>3.14</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <executable>true</executable>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

3. Student.java

package com.excel.model;

import lombok.Data;

import java.util.Date;

@Data
public class Student {
    private long id;
    private String name;
    private int age;
    private String sex;
    private Date birthday;

    public Student() {
    }

    public Student(long id, String name, int age, String sex, Date birthday) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.sex = sex;
        this.birthday = birthday;
    }

}

4. TestController.java

package com.excel.controller;

import com.excel.model.Student;
import com.excel.service.ExcelService;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

/**
 * @date 2018/5/10
 */
@Controller
public class TestController {

    @Autowired
    private ExcelService excelService;

    @RequestMapping("/hello")
    public String hello() {
        return "/pages/index";
    }

    @RequestMapping("/downloadExcel")
    public ResponseEntity<byte[]> downloadExcel() {
        ResponseEntity<byte[]> responseEntity = null;
        try {
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            String fileName = java.net.URLEncoder.encode("学生信息表.xlsx", "UTF-8");

            List<Student> students = new ArrayList<Student>();
            students.add(new Student(10000001, "张三", 20, "男", new Date()));
            students.add(new Student(20000002, "李四", 24, "男", new Date()));
            students.add(new Student(30000003, "王五", 22, "男", new Date()));
            //生成EXCEL XLSX格式
            this.exportData(students, byteArrayOutputStream);

            //设置响应头让浏览器正确显示下载
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            headers.setContentDispositionFormData("attachment", fileName);
            responseEntity = new ResponseEntity<byte[]>(byteArrayOutputStream.toByteArray(), headers, HttpStatus.OK);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return responseEntity;
    }


    public void exportData(List<Student> students, OutputStream outputStream) {
        String header = "学生信息表";
        //EXCEL标题
        List<String> titles = Arrays.asList(new String[]{"学生id","姓名", "年龄", "性别", "生日"});
        //EXCEL列
        List<List<Object>> rows = new ArrayList<List<Object>>();

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
        //从给定数据获取指定列作为EXCEL列数据
        for (Student student : students) {
            List<Object> row = new ArrayList<Object>();
            //学生id
            row.add(student.getId());
            //姓名
            row.add(student.getName());
            //年龄
            row.add(student.getAge());
            //性别
            row.add(student.getSex());
            //生日
            row.add(sdf.format(student.getBirthday()));
            rows.add(row);
        }

        XSSFWorkbook xwb = excelService.excelForXLSX(header,titles, rows, "信息表");
        try {
            xwb.write(outputStream);
            outputStream.flush();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                xwb.close();
            }catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}

5. ExcelService.java

package com.excel.service;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.*;
import org.springframework.stereotype.Service;
import java.util.List;

/**
 * @date 2018/5/10
 */
@Service
public class ExcelService {

    /**
     * excel
     * @param titles 表头
     * @param rows 数据行
     * @param sheetName 工作表名
     * @return
     */
    public XSSFWorkbook excelForXLSX(String header, List<String> titles, List<List<Object>> rows, String sheetName) {
        XSSFWorkbook xwb = new XSSFWorkbook();
        XSSFSheet sheet = xwb.createSheet(sheetName==null? "sheet1" : sheetName);

        //创建第一行头部并设置行高及合并单元格样式
        sheet.addMergedRegion(new CellRangeAddress(0,0,0,titles.size()-1));
        XSSFRow row1 = sheet.createRow(0);
        row1.setHeight((short)600);
        /**
         * 头部样式设置
         */
        //设置字体
        XSSFFont fontHeader = xwb.createFont();
        fontHeader.setFontName("宋体");
        fontHeader.setFontHeightInPoints((short)16);
        fontHeader.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);// 字体加粗
        XSSFDataFormat formatHeader = xwb.createDataFormat();
        //设置单元格格式
        XSSFCellStyle styleHeader = xwb.createCellStyle();
        styleHeader.setFont(fontHeader);
        styleHeader.setDataFormat(formatHeader.getFormat("@"));  //设置输入格式为文本格式
        styleHeader.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        styleHeader.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        styleHeader.setWrapText(true);
        //给单元格赋内容
        XSSFCell cell1 = row1.createCell(0);
        cell1.setCellStyle(styleHeader);
        cell1.setCellValue(new XSSFRichTextString(header));


        //创建第二行标题并设置行高
        XSSFRow row = sheet.createRow(1);
        row.setHeight((short)400);
        /**
         * 标题样式设置
         */
        //设置字体
        XSSFFont fontTitle = xwb.createFont();
        fontTitle.setFontName("宋体");
        fontTitle.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);// 字体加粗
        fontTitle.setFontHeightInPoints((short)10);
        XSSFDataFormat format = xwb.createDataFormat();
        //设置单元格格式
        XSSFCellStyle styleTitle = xwb.createCellStyle();
        styleTitle.setFont(fontTitle);
        styleTitle.setDataFormat(format.getFormat("@"));  //设置输入格式为文本格式
        styleTitle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        styleTitle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        styleTitle.setWrapText(true);

        /**
         * 主体样式设置
         */
        //设置字体
        XSSFFont font = xwb.createFont();
        font.setFontName("宋体");
        font.setFontHeightInPoints((short)10);
        //设置单元格格式
        XSSFCellStyle style = xwb.createCellStyle();
        style.setFont(font);
        style.setDataFormat(format.getFormat("@"));  //设置输入格式为文本格式
        style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        style.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        style.setWrapText(true);

        //设置标题单元格内容
        for(int i = 0; i < titles.size(); i++){
            XSSFCell cell = row.createCell(i);
            cell.setCellStyle(styleTitle);
            cell.setCellValue(new XSSFRichTextString(titles.get(i)));
            sheet.setColumnWidth(i, 5000);
            sheet.setDefaultColumnStyle(i, style);
        }
        //设置主体单元格内容
        XSSFCell cell;
        int rowIdx = 2;
        for(List<Object> dr : rows) {
            row = sheet.createRow(rowIdx);
            for(int di=0; di < dr.size(); di++) {
                cell = row.createCell(di);
                cell.setCellStyle(style);
                String cellValue = "";
                if(dr.get(di)==null){
                    cellValue = "";
                }else{
                    cellValue = dr.get(di)+"";
                }
                cell.setCellValue(new XSSFRichTextString(cellValue));
            }
            rowIdx ++;
        }
        return xwb;
    }

}

6. ExcelApplication.java

package com.excel;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @date 2018/5/10
 */
@SpringBootApplication
public class ExcelApplication {

    public static void main(String[] args) {
        SpringApplication.run(ExcelApplication.class,args);
    }
}

7. index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<h2><a href="/downloadExcel">导出Excel</a></h2>
</body>
</html>

8. 页面

 9. excel.xlsx